Centrifugal pump.



C. R. LANG! CENTRIFUGALPUMP. APPLICATION FILED FEB. 14, 1911- Patented Sept. 25,1917. 2 SHEETS-SHEET 1- N, a 2. .mu 1% Z C. R. LANG.

CEN TRIFUGAL YPUMP. APPLICATION FILED FEB. 14, 911.

- Patented Sept. 25,1917.

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CHARLES RUSSELL LANG, OF CATI-ICART, GLASGOW, SCOTLAND, ASSIGNOR TO & J. WEIR, LIMITED, OF GLASGOW, SCOTLAND.

CENTRIFUGAL BUMP.

Specification of Letters Extent.

Patented Sept. 25, 1917.

Application filed February 14, 1917. Serial No. 148,576.

To all whom it may concern:

Be it known that I, CHARLES RUSSELL LANG, a subject of the King of Great Britain and Ireland, residing at Holm Foundry, Cathcart, Glasgow, Scotland, haveinvented certain new and useful Improvements in Centrifugal Pumps; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

It is common practice tosplit the casing of a centrifugal pump into two parts by a horizontal plane containing the axis of rotation of the wheel or rotor; and centrifugal pump casings have, in addition, been split by a vertical plane at right angles to the axis of rotation and dividing the casing into two similar parts.

The present invention relates to the construction of casings 'of centrifugal pumps of that type in which there are two wheels or rotors acting in parallel, both contained in the one casing, and both provided with double admission.

The object of the present invention is to so divide up the casingas to enable it to be manufactured in a convenient and economical manner and the pump put together and opened up for inspection conveniently and expeditiously.

The invention consists in a construction of centrifugal pump casing which will be described in the following specification: the invention will be particularly defined in the annexed claims. v

The invention will be described with reference to the accompanying drawings which illustrate a pump casing constructed in accordance with the invention and in which Figure 1 is a vertical section on the line B B of Fig. 2 looking toward the left.

Fig. 2 is a section on the lineA A of Fig. 1, and

Fig. 3 is a partial plan of the lower part of the pump casing, that is, the part of the casing below the axes of the wheels.

9 is the suction port, it the suction chamber, m, n the wheel and volute chambers for the two wheels, 79 the discharge chamber, and q the discharge port.

The pump casing is built up of the following parts connected together by bolts or p1ns:-

b, casting which incloses the suction chamber h,

a, a, castings which inclose the lower parts of the wheel and volute chambers m, n,

e, casting which incloses the discharge chamber p, and

c, casting which divides the discharge chamber from that portion of the suction chamber which is situated between the two wheel chambers.

The castings b and a, a are situated wholly below the axis of rotation of the pump and include between them the whole of the casing of the pump situated below this axis. The castings a, a are held to the casting b by bolts 5, s and held to each other by the threaded rod j and nuts 0, 0. These three castings are connected together independently of the other two castings and for certain purposes can be treated as one part.

The castings 0 and e are situated wholly above the axis of rotation of the pump and include between them the whole of the cas ing of the pump situated above this axis. These two castings are connected together by bolts u, n and can for certain purposes be considered as one part. The casting 0 may be provided with ears f, f to form channels r, 1 in the upper part of the casing through which the water passes from the volutes to the discharge chamber.

The castings b and c are formed with horizontal flanges 00, y and are connected together by bolts orstuds which pass through holes a, e in these flanges. One of these bolts is shown at t in Fig. 2.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. A casing for a centrifugal pump with twin rotors in parallel, the said casing containing a wheel and volute chamber for each rotor, a suction port, a suction chamber situated both outside and between the two wheel and volute chambers, a discharge chamber, and a discharge port, and the said casing being divided into two portions, one of which contains the said suction port and the greater part of the said suction chamber while the other contains the said discharge pieces, one of which forms the outside walls of a part of the said suction chamber while the other two form the walls of a part of the wheel and volute-chambers of thetwo rotors respectively, and the latter portion being made up of two pieces one of which includes,

the outside walls of the said discharge chamher while the other includes the partition separating the discharge chamber from thatportion of the suction, chamber which is situated between the two wheel and volute chambers.

2. A casing for a centrifugal pump with twin rotors in parallel, the said casing containing a wheel and volute chamber for each rotor, avsuction port, a suction chambersituated both outside and between the two wheel and volute chambers, a discharge chamber, and a discharge port, and the said casing being divided into two portions, namely a lower portion-situated wholly below the axis of rotationof the pump and containing the said suction port and the greater part of the said suction chamber, and an upper portion situated wholly above the axis of rotation of the pump and containing the said discharge chamber and the said discharge port, the said: lower portion being made up of three pieces, one of which formsthe outside walls of the sub-axial part of the said suction chamber while the other two form the walls of, the sub-axial parts of the wheel and volute chambers 01": the two rotors respectively, and the said upper portion being made up of'two pieces one of wliiclrincludes the outside walls of the said discharge chamber while the other. includes the roof of that portion of the suction chamber situated between the two wheel and volute chambers.

3. A casing fora centrifugal pump with twin rotors in parallel, the said casing containing a wheel and volute chamber for each rotor,.a,suction port, asuction chamber situated both outside and betweenthe two wheel and volute chambers, a discharge chamber, and a discharge port, and the said casing being divided. into two portions, one oii which. contains the said suction port and the greater part of the said suction chamber while the other contains the said discharge chamber and the saidv diScharge port, the former portion being made up of three pieces, one of which forms the outside walls of a part of the said suction chamber while i the other two form the walls ofa part of the wheel and volute chambers of the two rotors respectively, and the latter portion being made up of two pieces one of which includes the outside walls of the said discharge chamber while the other includes the partition separating the discharge chamber ing divided into-twopontions, one of which contains thesaidsuctionport andthe-greater Part of, the said suction. chamber while heother centainsithe said discharge chamer and. he said, discharge port,- the. fo mer portion being made up of three; pieces, one of w ich for-ms the; outside walls. of; pa t of the said suction chamber whilethe other two formthe: Walls off a part: of? the wheel and volute chambers, of; the two rotors respectively, the twowlatter pieces, being connected to each other by a threaded; rodi parallelto-the-axis 01f rotation ofthe pump and connected teat-he former-piece by bolts with; axes at rightangles tothe said th-rcadedvrod,

and the latter portion being madeup of two pieces one of which includes the outside walls of the said discharge chamber while the th r includes the part tion. separating the discharge chamber from that portionof the; suction ,e 1a 1r1l0er hich is situated between the, two wheel and. volute chambers.

I hereby sign my name tot-his specifica:

tion. v v CHARLES RUSSELL LANG,

Gaines 0f thisieatent max bedobtained for five cents eacaby; addressing the; Gommissionerpfi r gents,

' Wa hing n, 1?. G3 o 

